Sorry but not sure what u mean. In the TOEFL are u referring to the IBT, PBT? Just was wondering if it´s worth spending the money in any of it? I hear-read that a lot of people take the TOEFL but here in Spain i don´t see it. Can´t even find someone that will certify me for it. Thanks.

To become an IELTS examiner, you will need to take the course (if that's the right word- usually called "standardisation" I think) run by experienced IELTS examiners, usually meaning at a British Council. This is free I believe, but you have to agree to do a certain number of tests per year and it is very difficult to get on the course, meaning you will need experience of teaching it and often a Diploma level qualification.

To teach IELTS, however, there is no such thing as a certification and every school will recruit teachers in their own way. It can't hurt to know as much as you can about the exam and how to teach it, but there's plenty of stuff on the internet about that